Method of producing elastic fabric



Aug. 312, 1930 -J. v MOORE METHOD OF PRODUCING ELASTIC FABRIC OriginalFiled March 1, 1929 1 N V EN TOR. fly? 17700712.

A TTORNEYzS in the appended claims.

Patentecl 12, 1930 UNITED STATES PATENT OFFICE JOHN V. MOORE, OFPAWTUOKE'I, RHODE ISLAN'D, ASSIGNOR TO MOORE FABRIC COM- PANY, OFPAWTUCKET, RHODE ISLAND, A CORPORATION OF RHODE ISLAND METHOD OFTRODUCING ELASTIC FABRIC Original application This is a division of myapplication, Serial No. 343,662, filed by me March 1, 1929. Thisinvention relates to the production of curvilinear elastic fabric andmore particularly to a method of producing relatively narrow elasticfabric, adapted for use in sanitary belts, garters and other similararticles.

It is the object of my invention to provide an improved method andprocedure for producing such curvilinear elastic fabric.

My invention further relates to arrangements of operations which willbehereinafter described and more particularly pointed out A form ofmechanism by the use of which my invention may be practiced is shown inthe drawings, in which T Fig. 1 is a perspective view of portions of anarrow fabric loom, and

Fig. 2 is a perspective view of a modified warp beam.

Referring portions of a to the drawings, I have "shown narrow fabricloom including a lay 11 having gu ding ciprocated, a reed 13, aplurality of harnesses 1 1, a warp guide-roll 15 at ably mounted abovethe guide-roll 15. The reed I3 is preferably graduated with the dentsmore closely together toward the left hand end of the reed as viewedinthe draw- Tiroups of elastic Warp threads WV are wound on sectional warpbeams 20, mounted for independentrotation' and'separately tensioned byfriction devices 22, of which one only is shown. It will be understood,however, that one such device is provided for each warp beam 20.

The warps WV pass an elevated guide-bar 24 and thence to the assemblyreed 16,,

Binder warps B a're'wound on a single cylindric al warp beam 30 mountedfor separate rotation and separately tensioned/by a frietion device 31.

Thewoven fabric F passes over the breast beam 10 to a conical take-uproll 40, mounted on a shaft 41 and positively driven. A guideroll 42increases the lap of the fabric F on the the rear of the. harnesses, andan assembly reed 16, prefer-.

from the beams 20 over of the fabric, 'ing of the elastic warps andstill further reducing the relative contraction thereof at the besubstituted for the straight warp filed March 1, 1929, Serial No.343,662. Divided and this applicationfiled June 21,

1930. Serial No. 462,845.

take-up roll 40 and the fabric passes from the roll 42 to a conicalcloth roll 44. A conical guide r011 46 may be provided on the breastbeam 10.

- The method of production of curvilinear elastic fabric by use ofthemechanism described is as follows:

The woven fabric is drawn downward by the conical take-up roll 40, butthe non-elastic binder warp threads B are supplied from the cylindricalwarp beam 30. The joint effect is to tension the binder warps increasingtowards the large end of the take-up roll 40, leaving the binder warpstoward the smaller end relatively slack.

The elastic warp'threads W are preferably woven under relatively heavybut substantially uniform tension, which tension is maintainedsubstantially uniform during the weaving, as the warp beams are mountedto rotate independently and will let off a greater length of warp towardthe side of the fabric corresponding to the larger end of the take-uproll 40;

The more tightly the binder warps are tcnsioned, the more firmly theybind the elastic warps. The nore tightly the elastic warps are boundinto the fabric, the less they are able to contract when the fabric isreleased from the tension.

Consequently the edge of the fabric where the binder warps are undergreater tension and more tightly the release than the edge of the fabricwhere the binder warps are relatively slack tensioned. The fabric willthus assume a curvilinear shape,'with the long edge of the fabrictowards the larger end of the take-up roll 40.

The results thus far. described could be attained with a reed of uniformspacing, but the curvilinear effect is increased by use of thegraduatedtreed 13, which crowds-the warp threads more closely togetherat the long edge thus increasing the close bindlong edge.

If still further curvature is desired, a slightly tapered warp beam 60(Fig. 2) may beam 0 woven will be longer upon Y shown in Fig. 1. If thelarger end of the warp beam 60 is placed at the right, or toward-theshort edge of the woven fabric, the slackness of the binder warps on theshort edge will be accentuated and a sharper curvature will be secured.

Claims to the. fabric per se are not made herein, as they form thesubject matter of my original application, Ser. No. Claims to themechanism and specific method claims based on the detailed operationthereof are not made herein, as they form the subject matter of adivisional application, Serial Nor 38,785 filed by me March 25, 1930.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is I tion of contraction fromoneedge to th In testimony whereof fixed my signature.

1. The method of weaving curvilinear elastic fabric which consists insupplying elastic warp threads under substantially uniform tension,supplying binder warps, inserting weft and binding the elastic warpsmore firmly between said binder warps towards one edge of the fabric,thereby restricting the contraction of said elastic warps.

2, The method of weaving curvilinear elastic fabric which consists insupplying rubber warp threads of substantially uniform diameter andunder substantially uniform tension, supp lying non-elastic warpthreads, inserting weft threads and taking up the woven fabric, andinvariably control.- ling the shrinkage of the rubber warp threads afterthe weft is inserted, whereby greater shrinkage occurs at one edge ofthe'woven fabric and curvature is effected.

3. The method of weaving curvilinear elastic fabric which consists insupplying rubber warp threads of substantially uniform diameter andunder substantially uniform tension, supplying non-elastic warp threadsrelatively tight at one selvage and relatively loose at the otherselvage at the point of weaving, inserting weft threads, and taking upthe woven fabric, the non-elastic warp threads variably controlling theshrinkage of the rubber warp threads after the weft is inserted, wherebygreater shrinkage occurs at one edge of the fabric and curvature isefiected.

4. The method of weaving curvilinear I progressively increasing e otherof the'fabric.

I have hereunto af- JOHN v. MOORE.

CERTIFICATE OF CORREGTION.

Patent No. 1,772,958. Granted August 12, 1930, to

JOHN V. MOORE. v

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 2,line 34, claim 2, for the word "invariably" read in variably; and thatthe said Letters Patent should be read with this correction therein thatthe same may conformv t0 the record of the case in the Patent Office.

Signed and sealed this 21st day of ()ctobcr, A., D. 1930.

M. Moore;

(Seal) Acting Commissioner oi Patents. '7

